Both LTC1043s function as the sampled data equivalent of a resistor within the bandwidth set by Al`s 0.01-I`F value and the switched-capacitor equivalent feedback resistor. The time-averaged current delivered to the summing point by LTC1043A is a function of the 0.01-I`F capacitor`s input-derived voltage and the commutation frequency at pin 16. Low-commutation frequencies result in small time-averaged current values, and require a large input resistor. Higher frequencies require an equivalent small input resistor.